Java 多线程

 多线程模拟并发

    @Test
    public void test1() throws InterruptedException {
        final CountDownLatch latch= new CountDownLatch(4);//使用java并发库concurrent
        //启用10个线程
        for(int i=1;i<=10;i++){
            new Thread(new Runnable(){
                public void run(){
                    try {
                        //Thread.sleep(100);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    System.out.println(String.format("子线程%s执行！",Thread.currentThread().getName()));
                    latch.countDown();//让latch中的数值减一
                }
            }).start();
        }
        //主线程
        latch.await();//阻塞当前线程直到latch中数值为零才执行
        System.out.println("主线程执行！");
    }

 

 

 

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